Algebra
posted by Nick .
A jar contains red, blue and yellow marbles.The number of red marbles is ten more than the number of yellow marbles and the number of blue marbles is double the number of yellow marbles. If the probability of choosing a yellow marble is onefifth , how many marbles are in the jar?

yellow marbles  x
blue marbles  2x
red marbles  x+10
total = 4x + 10
prob to choose a yellow = x/(4x+10) = 1/5
5x = 4x+10
x = 10
10 yellows , 20 blues, and 20 reds for a total of 50 marbles
Respond to this Question
Similar Questions

Probabilities
A jar contains 2 red marbles, 3 green marbles, 4 blue marbles, and 5 yellow marbles. Two marbles are drawn in succession, without replacement. The probability that neither is yellow? 
statistics
From a jar of marbles containg 4 blue marbles, 3 yellow marbles, 2 red marbles, and 1 magenta marble, you draw two marbles with replacement. Determine the following probablilites. a. P( red then blue) b. P(yellow and yellow) c. P(red/yellow) … 
Algebra
Out of jar with 100 marbles, 49 are blue marbles, 7 are green marbles, 27 are red marbles and 17 are yellow marbles. What is the probability of drawing a red marble? 
Math
a bag contains 3 red marbles, 5 blue marbles, 2 yellow marbles, and 2 lavender marbles. How many sets of 4 marbles includes at most one of the yellow marbles? 
Math
6 red marbles 5 yellow marbles and 4 blue marbles. Write a fraction in simplest form that compares the number of red marbles to total number of marbles 
probability
A bag contains 3 red marbles, 3 blue marbles and 3 yellow marbles. Which of the following methods of selecting 2 marbles will have the greater probability of choosing 2 red marbles? 
Maths
a bag contains marbles of three different colours, red, blue and yellow. 2/5 of the marbles are red. The ratio of the number of blue marbles to the number of yellow marbles is 5:7. what fraction of the marbles in the bag is blue? 
Math
I am having a problem answering this math problem. Andrea has a box of marbles in it. She has seven red marbles, thirteen blue marbles and nineteen yellow marbles. If she reaches in and takes out marbles without looking, what is the … 
Maths
A bag contains marbles of three different colours red, blue , yellow. 2/5 of the marbles are red. The ratio of the number of blue marbles to the number of yellow marbles is 5:7. What fraction of the marbles in the bag is blue? 
Math
A bag contain marbles of three different colours red blue and yellow 2/5of the marbles are red the ratio of three number of blue marbles to the number of yellow marbles is5:7 what fraction of the marbles in the bag is blue